public void ReadAndParseFirstLine()
        {
            ItemEntity entity = new ItemEntity();
            using (var file = new FixedWidthFile(filename))
            {
                file.Open();
                var line = file.ReadLine();
                entity.Name = line.GetField(0, 19).ToString().Trim();
                entity.Price = line.GetField(20, 29).TryToDecimal() ?? 0;
                entity.UPC = line.GetField(29, 42).ToString();
                entity.Size = line.GetField(42, 52).ToString().Trim();
                entity.Brand = line.GetField(52, 72).ToString().Trim();
                entity.EffectiveDate = line.GetField(73, 82).TryToDateTime();
            }

            Assert.AreEqual("Pepsi Max", entity.Name);
            Assert.AreEqual(1.69M, entity.Price);
            Assert.AreEqual("0120000011880", entity.UPC);
            Assert.AreEqual("20oz", entity.Size);
            Assert.AreEqual("Pepsi", entity.Brand);
            Assert.AreEqual(new DateTime(2011, 6, 18), entity.EffectiveDate);
        }
        public void AlternateFieldAccessMethod()
        {
            ItemEntity entity = new ItemEntity();
            using (var file = new FixedWidthFile(filename))
            {
                file.Open();
                var line = file.ReadLine();
                entity.Name = line[0, 19].ToString().Trim();
                entity.Price = line[20, 29].TryToDecimal() ?? 0;
                entity.UPC = line[29, 42].ToString();
                entity.Size = line[42, 52].ToString().Trim();
                entity.Brand = line[52, 72].ToString().Trim();
                entity.EffectiveDate = line[73, 82].TryToDateTime();
            }

            Assert.AreEqual("Pepsi Max", entity.Name);
            Assert.AreEqual(1.69M, entity.Price);
            Assert.AreEqual("0120000011880", entity.UPC);
            Assert.AreEqual("20oz", entity.Size);
            Assert.AreEqual("Pepsi", entity.Brand);
            Assert.AreEqual(new DateTime(2011, 6, 18), entity.EffectiveDate);
        }